I did finally find the chain named in my 'Feanor and Gems' covered paperback of The Silmarillion (pg 49 and 303). And 'anga' means 'iron' so there you have it. In addition, the collar they placed around Morgath's neck was iron, as it was fashioned from his iron crown sans the two gems that taken by Eönwë.
I figure all our quizzes are open book, but would rather we refrained from using Google, Foster, or the 'Encl. of Arda' until no one can come up with an answer after a day or two.
By the way, the title of the thread is LOTR Quiz, which should preclude questions from The Silmarillion, but I shan't quibble. :orcgin:
So far I haven't come up with and elf with the same name as one of the two trees, but the trees did go by many names.
'Share and enjoy'